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Theorem issubc2 16268
Description: Elementhood in the set of subcategories. (Contributed by Mario Carneiro, 4-Jan-2017.)
Hypotheses
Ref Expression
issubc.h 𝐻 = (Homf𝐶)
issubc.i 1 = (Id‘𝐶)
issubc.o · = (comp‘𝐶)
issubc.c (𝜑𝐶 ∈ Cat)
issubc2.a (𝜑𝐽 Fn (𝑆 × 𝑆))
Assertion
Ref Expression
issubc2 (𝜑 → (𝐽 ∈ (Subcat‘𝐶) ↔ (𝐽cat 𝐻 ∧ ∀𝑥𝑆 (( 1𝑥) ∈ (𝑥𝐽𝑥) ∧ ∀𝑦𝑆𝑧𝑆𝑓 ∈ (𝑥𝐽𝑦)∀𝑔 ∈ (𝑦𝐽𝑧)(𝑔(⟨𝑥, 𝑦· 𝑧)𝑓) ∈ (𝑥𝐽𝑧)))))
Distinct variable groups:   𝑓,𝑔,𝑥,𝑦,𝑧,𝐶   𝑓,𝐽,𝑔,𝑥,𝑦,𝑧   𝑆,𝑓,𝑔,𝑥,𝑦,𝑧
Allowed substitution hints:   𝜑(𝑥,𝑦,𝑧,𝑓,𝑔)   · (𝑥,𝑦,𝑧,𝑓,𝑔)   1 (𝑥,𝑦,𝑧,𝑓,𝑔)   𝐻(𝑥,𝑦,𝑧,𝑓,𝑔)

Proof of Theorem issubc2
StepHypRef Expression
1 issubc.h . 2 𝐻 = (Homf𝐶)
2 issubc.i . 2 1 = (Id‘𝐶)
3 issubc.o . 2 · = (comp‘𝐶)
4 issubc.c . 2 (𝜑𝐶 ∈ Cat)
5 issubc2.a . . . . 5 (𝜑𝐽 Fn (𝑆 × 𝑆))
6 fndm 5890 . . . . 5 (𝐽 Fn (𝑆 × 𝑆) → dom 𝐽 = (𝑆 × 𝑆))
75, 6syl 17 . . . 4 (𝜑 → dom 𝐽 = (𝑆 × 𝑆))
87dmeqd 5235 . . 3 (𝜑 → dom dom 𝐽 = dom (𝑆 × 𝑆))
9 dmxpid 5253 . . 3 dom (𝑆 × 𝑆) = 𝑆
108, 9syl6req 2661 . 2 (𝜑𝑆 = dom dom 𝐽)
111, 2, 3, 4, 10issubc 16267 1 (𝜑 → (𝐽 ∈ (Subcat‘𝐶) ↔ (𝐽cat 𝐻 ∧ ∀𝑥𝑆 (( 1𝑥) ∈ (𝑥𝐽𝑥) ∧ ∀𝑦𝑆𝑧𝑆𝑓 ∈ (𝑥𝐽𝑦)∀𝑔 ∈ (𝑦𝐽𝑧)(𝑔(⟨𝑥, 𝑦· 𝑧)𝑓) ∈ (𝑥𝐽𝑧)))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 195  wa 383   = wceq 1475  wcel 1977  wral 2896  cop 4131   class class class wbr 4578   × cxp 5026  dom cdm 5028   Fn wfn 5785  cfv 5790  (class class class)co 6527  compcco 15729  Catccat 16097  Idccid 16098  Homf chomf 16099  cat cssc 16239  Subcatcsubc 16241
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4694  ax-sep 4704  ax-nul 4712  ax-pow 4764  ax-pr 4828  ax-un 6825
This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4368  df-iun 4452  df-br 4579  df-opab 4639  df-mpt 4640  df-id 4943  df-xp 5034  df-rel 5035  df-cnv 5036  df-co 5037  df-dm 5038  df-rn 5039  df-res 5040  df-ima 5041  df-iota 5754  df-fun 5792  df-fn 5793  df-f 5794  df-f1 5795  df-fo 5796  df-f1o 5797  df-fv 5798  df-ov 6530  df-oprab 6531  df-mpt2 6532  df-pm 7725  df-ixp 7773  df-ssc 16242  df-subc 16244
This theorem is referenced by:  0subcat  16270  catsubcat  16271  subcidcl  16276  subccocl  16277  issubc3  16281  fullsubc  16282  rnghmsubcsetc  41761  rhmsubcsetc  41807  rhmsubcrngc  41813  srhmsubc  41860  rhmsubc  41874  srhmsubcALTV  41879  rhmsubcALTV  41893
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